I'm not sure if anyone else discovered this, but the devRant Android app doesn't delete abandoned comments, so if you start to reply to someone's comment (automatic @mention) and back out without typing anything, the next reply you hit on the same thread will append the @mention after the previous one. You can also insert a commenter's name into a comment fairly easily this way. I am relatively new here, and am curious if this is the desired behavior.

While this has potential to be useful, I would appreciate the option to clear a comment box entirely, since I often abandon a comment part-way because I re-think how I want to say something very often.